@jcatoe I use a Dexcom G6 (and an Omnipod 5 insulin pump). I usually have these devices on my abdomen. I rotate them around from left to right and above my waist & below my waist. Sometimes I have used the backside of my upper arms, but that requires help from my husband. I have had times when the continual glucose monitor (CGM) and the glucose monitor were way off from each other. I contacted the customer service helpline. First they reiterated that a glucose meter tests blood sugar and a CGM tests interstitial fluid ; the CGM can take awhile to catch up to the glucose meter. They also said that the CGM is not accurate when the level is very high (over 300) or very low (less than 40). They further said to make sure to check the glucose meter whenever there is a site change. The Dexcom G6 has a 2 hour warm up period so I use the glucose meter during that timeframe. The customer service people also said there are ranges or percent differences that are acceptable between the two devices. Mine usually stay within 10 points of each other; except on site change days the difference can be much larger. My take away from all that was while having a CGM is helpful and convenient, when in doubt trust the glucose meter.